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HBD Update

HBD Update. Itzhak Tserruya DC meetingJune 10, 2009. Most Recent Scan. Anlz: H=0.0ppm, O=0.3ppm Trans: H=0.0ppm, O=0.0ppm %Int. Trans (Fit: 112-186nm)=100.0% %Int.Trans. (Data: 134-168nm)=102.2%. Anlz: H=6.8ppm, O=3.3ppm Trans: H=31.6ppm, O=4.1ppm %Int. Trans (Fit: 112-186nm)=88.4%

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HBD Update

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  1. HBD Update Itzhak Tserruya DC meetingJune 10, 2009

  2. Most Recent Scan Anlz: H=0.0ppm, O=0.3ppm Trans: H=0.0ppm, O=0.0ppm %Int. Trans (Fit: 112-186nm)=100.0% %Int.Trans. (Data: 134-168nm)=102.2% Anlz: H=6.8ppm, O=3.3ppm Trans: H=31.6ppm, O=4.1ppm %Int. Trans (Fit: 112-186nm)=88.4% %Int.Trans. (Data: 134-168nm)=92.6% Anlz: H=4.1ppm, O=1.3ppm Trans: H=27.6ppm, O=4.5ppm %Int. Trans (Fit: 112-186nm)=89.3% %Int.Trans. (Data: 134-168nm)=95.3% Ever since the flow rate was increased to ~4lpm just before the start of the run, the ppm values in both arms have remained more or less stable.

  3. Transmittance History

  4. Present status • WEST: • All 10 modules up and running in a very stable mode since the beginning of the run. • EAST • 8 modules running in a reasonably stable mode since the beginning of the run. • 1 module very unstable (EN4) • 1 module disabled (ES1) since the beginning of the run. Has a short between the mesh and the top GEM. Not clear what happened • LeCroy HV PS • We still have some problems with one of the LeCroy PS which induces from time to time a trip in the quartet of modules that it supplies. Seems to behave better over the last week.

  5. Gain stability - West

  6. Gain stability - East

  7. Run-9 history: West Summary: one short in one module  0.2 % loss of acceptance

  8. Run-9 history: East

  9. Run-9 history: Summary • Summary West: • one short in one module  0.2 % loss of acceptance • Summary East: • ES1 disabled  2.6% loss of acceptance • ES2 1 ds  0.2 % loss of acceptance • ES3 2 ds  0.4 % • EN4 5 ds  0.9 % • EN5 1 ds  0.2 % • Total 4.3 % acceptance loss • Clear difference in the behavior of the West compared to the East reflecting the much better assembly procedure used for the West detector.

  10. Run-9 history: Summary (II) • Check for possible aging effects: two GEMs from the East arm, randomly chosen among those that were found to be perfect in the initial test back in December 2008, were retested on May 12, 2009 and found to be perfect with no sign of any aging effect.

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